With the rapid development of Internet, network security protocol plays an increasingly important role, which will enhance the security and stability of computer communication. Network security protocol can control the application process of computer communication technology, which will improve the computing communication environment. Through security protocol, we can guarantee the security of computer communication technology. In CTC system, this paper analyzes the practical application of computer security protocol. Through security protocol, we can guarantee the practical application effect of computer communication technology, which will promote the strengthening of security protocol in the future. In practical work, the security protocol will transfer information and data through a variety of methods, such as key distribution, identity authentication, data encryption and so on. Firstly, this paper analyzes the common security protocols. Then, this paper analyzes the role of security protocol.